Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"hermaphroditic"”.
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Characterization of the hermaphroditic reproductive system and sexual development in the planarian Schmidtea mediterranea
… male-specific expression of dmd-1 in both the hermaphroditic S. mediterranea and dioecious S. mansoni suggest one means by which modulation of sex-specific pathways can drive the transition from hermaphroditism to dioecy.
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Low Temperature Induction of Males and Other Developmental Anomalies in a Self-Fertilizing Hermaphroditic Fish Species
Rivulus marmoratus (Cyprinodont; Aplochelidae) is the only vertebrate known to reproduce by obligate internal self-fertilization. Selfing is the ultimate form of inbreeding and leads to virtual homozygosity in approximately ten generations, so that this mode of reproduction is effectively clonal. …
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Profiling gene expression during early gametophyte development and sex determination in Ceratopteris richardii
… has the potential to develop as either a male or hermaphroditic gametophyte. Gametophyte sex is determined by a GA-like pheromone (ACE) that is secreted by hermaphrodites approximately 6 days after spore inoculation and induces male development in other juvenile gametophytes. Our goal is to better …
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Pollinator Movement and Pollen Transfer in Hybrid Seed Canola
… seed canola requires the transfer of pollen from hermaphroditic (‘male’) to male-sterile (‘female’) plants, facilitated by managed pollinators (honey and leafcutter bees) and wild pollinators. I assessed pollinators in fields of hybrid seed canola located in Southern Alberta to determine what …
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Impact of self-fertilization on fecundity, the timing of first reproduction, and population genetic structure: Is a mate worth the wait?
… depression in an apparent self-compatible, hermaphroditic marine nemertean worm, Prosorhochmus americanus. Fecundity and timing to first reproduction were assessed in isolated and paired worms. Isolated worms produced significantly more offspring than paired worms and did not show inbreeding …
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Some observations on the life history of Strophitus edentulus
… Anodonta imbecillis (Say), is one of the hermaphroditic species and is not closely related to Strophitus. Since these two species are widely separated in structure, and since the same changes are occurring in each form, it is possible that we have here a case of convergent evolution, the …
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Earthlings : humanity's essential relationship with gravity
… seemingly disparate but intrinsically related as hermaphroditic snails, brine shrimp, space chickens developing normally and space frogs growing enormous heads. Not to mention astronauts re-learning to walk on depleted leg bones and individual human cells attempting division with damaged internal …
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A Culture in Denial: The Roman Cultural Relationship with Human Sacrifice
… ritual of devotio; the drowning of hermaphroditic children; the allegations of human sacrifice that permeated the Late Republic; and the examination of assassinations as to whether human sacrifice under the guise of defending the Republic was occurring.
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Comportamento reprodutivo de Mussismilia hispida (Verril, 1902) (Cnidaria, Anthozoa, Scleractinia)
… results showed that M. hispida is a sequential hermaphroditic species with a broadcast-spawning mode of reproduction, and external fertilization and development. Female cells developed prior to male cells, and were first observed in April/89. Size of Stage I oocytes partially immersed into …
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OOGENESIS IN TUBULARIA LARYNX AND TUBULARIA INDIVISA (HYDROZOA, ATHECATA)
… Older polyps of T. larynx are frequently hermaphroditic while T. indivisa is strictly dioecious.</p>
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Using molecular genetic techniques to detect outcrossing in natural populations of a self-fertilizing fish
The hermaphroditic fish, Rivulus marmoratus, is the only vertebrate known to reproduce by internal self-fertilization; this process results in populations of homozygous clones. Most natural populations consist entirely of hermaphrodites, but phenotypically distinct, fertile males occur at …
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The biology of Sassafras albidum (Nutt.) nees in regenerating upland hardwood stands in southwest Virginia following clear felling
… Although sassafras is reported to be delicious, hermaphroditic flowers were found on all sites. Comparison between male and female plants on each site suggest that males have a slight competitive advantage.
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High resolution alignment of the physical and genetic maps of the dpy-14 region of chromosome I in Caenorhabditis elegans
… four- to seven-fold more frequently than in hermaphroditic sperm. However, the arrays were transmitted frequently enough to make it possible to cross them into different genetic backgrounds. Males heterozygous for lethal alleles were mated with hermaphrodites that carried heritable …
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Sex Allocation in the Caribbean Coral, <em>Porites astreoides</em> (Lamarck)
… are to describe the reproductive biology of the hermaphroditic coral <em>Porites astreoides</em>, and to determine whether sex allocation varies with colony size or along a light-energy gradient. Tissue samples were collected at depths of 6, 13, 18 and 27 m and the surface area of each colony was …
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The significance of DAF-16 and its role in the phenotypic covariance of longevity, immunity and stress resistance in the Caenorhabditis nematodes
… stress resistance and higher immunity than the hermaphroditic species (Caenorhabditis elegans and Caenorhabditis briggsae). Interestingly, we also observe significant differences in expression levels between the daf-16 homologues in these species using Quantitative Real-Time PCR, which …
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Joyce Mansour's <i>Ça</i> and <i>Histoires nocives</i>: translations and critical interpretations
… paternal, maternal, sadistic, incestuous, hermaphroditic, lesbian, “natural,” demonic, intellectual etc.)</li><li>Search for epistemological realization (artistic, creative, aesthetic etc.)</li><li>Nihilism and pantheism (phenomenology of nature)</li><li>Semantic …
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Characterization of the sex chromosomes in spinach
… chromosomes have evolved from the autosomes of hermaphroditic species to maintain dioecy. The major barriers to sex chromosome characterization have been the inherent difficulties of working with a non-recombining sex determining region that make sequencing and mapping the Male-Specific region …
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Grammatical Gender and Transformation in Ovid's "Metamorphoses"
… whose joint transformations border on the hermaphroditic, metamorphoses of the natural landscape that resist the commonly held assumption that the earth is a feminine, generative body, and five narratives of sex-change that present the audience not with two binary genders, but a spectrum of …
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Population Dynamics of Sheepshead (<i>Archosargus probatocephalus;</i> Walbaum 1792) in the Chesapeake Bay Region: A comparison to Other Areas and an Assessment of Their Current Status
… of Cape Hatteras, with all sheepshead being non-hermaphroditic batch spawners, exhibiting early maturation by age 2, and a spawning season occurring from the late winter through the spring. When we integrate the information on age, growth and reproductive biology into a Beverton-Holt …
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Age, growth, reproductive biology and diet of Spondyliosoma emarginatum (Cuvier 1830) in the West Coast National Park, South Africa
… 55 were males and four were individuals with hermaphroditic gonads. Macroscopic and microscopic examination of gonads and monthly gonadosomtic indices suggest a spring spawning season and that steentjies are protgynous hermaphrodites with males significantly than females (t = 64.75, df = 301, …
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